<template>
	<view class="v-wrap">
		<view class="v-search-box">
			<view class="v-search-inner">
				<v-icon name="search" color="#909399" :size="28"></v-icon>
				<text class="v-search-text">搜索vcu-uni-view</text>
			</view>
		</view>
		<view class="v-menu-wrap">
			<scroll-view
				scroll-y
				scroll-with-animation
				class="v-tab-view menu-scroll-view"
				:scroll-top="scrollTop"
			>
				<view
					v-for="(item, index) in tabbar"
					:key="index"
					class="v-tab-item"
					:class="[current == index ? 'v-tab-item-active' : '']"
					:data-current="index"
					@tap.stop="swichMenu(index)"
				>
					<text class="v-line-1">{{ item.name }}</text>
				</view>
			</scroll-view>
			<block v-for="(item, index) in tabbar" :key="index">
				<scroll-view scroll-y class="right-box" v-if="current == index">
					<view class="page-view">
						<view class="class-item">
							<view class="item-title">
								<text>{{ item.name }}</text>
							</view>
							<view class="item-container">
								<view
									class="thumb-box"
									v-for="(item1, index1) in item.foods"
									:key="index1"
								>
									<image
										class="item-menu-image"
										:src="item1.icon"
										mode=""
									></image>
									<view class="item-menu-name">{{
										item1.name
									}}</view>
								</view>
							</view>
						</view>
					</view>
				</scroll-view>
			</block>
		</view>
	</view>
</template>

<script>
import classifyData from "@/common/classify.data.js";
export default {
	data() {
		return {
			tabbar: classifyData,
			scrollTop: 0, //tab标题的滚动条位置
			current: 0, // 预设当前项的值
			menuHeight: 0, // 左边菜单的高度
			menuItemHeight: 0, // 左边菜单item的高度
		};
	},
	computed: {},
	methods: {
		getImg() {
			return Math.floor(Math.random() * 35);
		},
		// 点击左边的栏目切换
		async swichMenu(index) {
			if (index == this.current) return;
			this.current = index;
			// 如果为0，意味着尚未初始化
			if (this.menuHeight == 0 || this.menuItemHeight == 0) {
				await this.getElRect("menu-scroll-view", "menuHeight");
				await this.getElRect("v-tab-item", "menuItemHeight");
			}
			// 将菜单菜单活动item垂直居中
			this.scrollTop =
				index * this.menuItemHeight +
				this.menuItemHeight / 2 -
				this.menuHeight / 2;
		},
		// 获取一个目标元素的高度
		getElRect(elClass, dataVal) {
			new Promise((resolve, reject) => {
				const query = uni.createSelectorQuery().in(this);
				query
					.select("." + elClass)
					.fields({ size: true }, (res) => {
						// 如果节点尚未生成，res值为null，循环调用执行
						if (!res) {
							setTimeout(() => {
								this.getElRect(elClass);
							}, 10);
							return;
						}
						this[dataVal] = res.height;
					})
					.exec();
			});
		},
	},
};
</script>

<style lang="scss" scoped>
.v-wrap {
	height: calc(100vh);
	/* #ifdef H5 */
	height: calc(100vh - var(--window-top));
	/* #endif */
	display: flex;
	flex-direction: column;
}

.v-search-box {
	padding: 18rpx 30rpx;
}

.v-menu-wrap {
	flex: 1;
	display: flex;
	overflow: hidden;
}

.v-search-inner {
	background-color: rgb(234, 234, 234);
	border-radius: 100rpx;
	display: flex;
	align-items: center;
	padding: 10rpx 16rpx;
}

.v-search-text {
	font-size: 26rpx;
	color: $v-tips-color;
	margin-left: 10rpx;
}

.v-tab-view {
	width: 200rpx;
	height: 100%;
}

.v-tab-item {
	height: 110rpx;
	background: #f6f6f6;
	box-sizing: border-box;
	display: flex;
	align-items: center;
	justify-content: center;
	font-size: 26rpx;
	color: #444;
	font-weight: 400;
	line-height: 1;
}

.v-tab-item-active {
	position: relative;
	color: #000;
	font-size: 30rpx;
	font-weight: 600;
	background: #fff;
}

.v-tab-item-active::before {
	content: "";
	position: absolute;
	border-left: 4px solid $v-primary;
	height: 32rpx;
	left: 0;
	top: 39rpx;
}

.v-tab-view {
	height: 100%;
}

.right-box {
	background-color: rgb(250, 250, 250);
}

.page-view {
	padding: 16rpx;
}

.class-item {
	margin-bottom: 30rpx;
	background-color: #fff;
	padding: 16rpx;
	border-radius: 8rpx;
}

.item-title {
	font-size: 26rpx;
	color: $v-main-color;
	font-weight: bold;
}

.item-menu-name {
	font-weight: normal;
	font-size: 24rpx;
	color: $v-main-color;
}

.item-container {
	display: flex;
	flex-wrap: wrap;
}

.thumb-box {
	width: 33.333333%;
	display: flex;
	align-items: center;
	justify-content: center;
	flex-direction: column;
	margin-top: 20rpx;
}

.item-menu-image {
	width: 120rpx;
	height: 120rpx;
}
</style>
